Re: Context switch times

[David S. Miller]

   From: Richard Gooch <[e-mail]>
   Date: Thu, 4 Oct 2001 15:39:05 -0600

   David S. Miller writes:
   > lat_ctx doesn't execute any FPU ops.  So at worst this happens once
   > on GLIBC program startup, but then never again.
   
   Has something changed? Last I looked, the whole lmbench timing harness
   was based on using the FPU.

Oops, that's entirely possible...

But things are usually layed out like this:

	capture_start_time();
	context_switch_N_times();
	capture_end_time();

So the FPU hit is only before/after the runs, not during each and
every iteration.

Franks a lot,
David S. Miller
[e-mail]